Ignitions and Electrical› Ignition Components
Oregon Tool
OREGON SPARK PLUG NGK B4LM
SKU: O02Y 77-313-1
Beginner — under 30 min
Description
This spark plug features an anti-drain valve, a mounting thread of M20 x 1.5, and a micron rating of 27. Its outer dimensions are 3-1/8 inches in diameter and 2-7/8 inches in height, with a mounting seal outer diameter of 2-1/2 inches.
Fitment
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Specifications
| Brand | Oregon Tool |
| Part Number | O02Y 77-313-1 |
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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